Error messages log files are maintained for DB2 Data Links Manager, DB2 on the Data Links server, and for the DB2 system that contains the database with the DATALINK data type.
On AIX, error messages log files are located in the /INSTHOME/sqllib/db2dump/db2diag.log directory where INSTHOME is the home directory of the instance owner.
On Windows NT, error messages log files are located in the x:\sqllib\instance\db2diag.log directory, where:
You can control the level of the detailed information that is written to the db2diag.log file using a combination of the DIAGLEVEL database manager configuration parameter and DLFM_LOG_LEVEL registry value. For more information on error messages and error message log files, refer to the Administration Guide.